Variable Aperture Module Using SMA Wire and Hall Feedback
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Solution Overview
Problem
Current camera modules face challenges in controlling the relative rotation of movable and fixing components of the variable aperture structure quickly and accurately.
Innovation Solution
A variable aperture module utilizing a shape memory alloy wire with clamping components to control the rotation of movable and fixing components, enabling precise aperture adjustments through current application, and incorporating a Hall sensor for enhanced accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional variable aperture structure is used with movable and fixing components, then aperture size can be adjusted, but the control speed and accuracy of relative rotation between components is insufficient
Solution Approach 1:
The patent replaces the conventional mechanical rotation control system with a magnetic field-based control system. A magnet is attached to the movable component, and a Hall sensor mounted on the fixing component detects the magnet's position and rotation angle through magnetic field changes. This substitution of mechanical sensing with magnetic field sensing enables both faster response speed and higher measurement precision in aperture control.
Solution Approach 2:
The patent introduces a Hall sensor as an intermediary between the movable component and the control system. The Hall sensor indirectly measures the rotation angle by detecting magnetic field changes caused by the moving magnet, rather than directly measuring mechanical rotation. This intermediary approach allows for non-contact, high-speed, and high-precision detection of the aperture blade's position.
2Productivity
If conventional aperture control mechanism is used, then basic aperture adjustment is achieved, but the precision and efficiency of camera lens operations are limited
Solution Approach 1:
The patent implements a feedback control mechanism where the Hall sensor continuously detects the magnet's position on the movable component and provides real-time position information. This feedback enables the control system to accurately determine the aperture blade's rotation angle and make precise adjustments, thereby improving both the precision and efficiency of camera lens operations. The real-time feedback loop ensures accurate aperture control without mechanical contact.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables rapid and accurate control of aperture size changes, improving the precision and efficiency of camera lens operations.
Implementation Method 1
a shape memory alloy wire, a first clamping component, a second clamping component and a third clamping component. The movable component movably is disposed relative to the fixing component. The shape memory alloy wire has a first wire end and a second wire end.
Implementation Method 2
A variable aperture module utilizing a shape memory alloy wire with clamping components to control the rotation of movable and fixing components, enabling precise aperture adjustments through current application, and incorporating a Hall sensor for enhanced accuracy.
Data Source
AI summary
The variable aperture module includes a fixing component, a movable component, a shape memory alloy wire, a first clamping component, a second clamping component and a third clamping component. The movable component is movably disposed relative to the fixing component. The shape memory alloy wire has a first wire end and a second wire end. The first clamping component clamps the first wire end. The second clamping component clamps a portion of the shape memory alloy wire other than the first wire end and the second wire end. The third clamping component clamps the second wire end.